Molybdenum steel grades (often referred to as plain molybdenum or 40xx/44xx series steels) are specialized alloy steels valued for their exceptional high-temperature strength, resistance to structural softening, and superior hardenability. The introduction of molybdenum suppresses temper brittleness and refines grain structure, resulting in robust fatigue resistance. These characteristics make these alloys outstanding for high-stress power transmission parts, automotive gear assemblies, and specialized structural industrial bolting systems.
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